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		<title>test13</title>
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		变量a={$a}，变量b={$b}<br/>
		a+b={$a+$b}<br/>
		a-b={$a-$b}<br/>
		a*b={$a*$b}<br/>
		a/b={$a/$b}<br/>
		a%b={$a%$b}<br/>
		a++={$a++} ++a={++$a}<br/>
		b--={$b--} --b={--$b}
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